题目内容

单选题 Both humans and ()can be considered users of a database.

A. data
B. software
C. application programs
D. hardware

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单选题 In a three-level DBMS architecture, the layer that interacts directly with the hardware is the () level.

A. external
B. conceptual
C. internal
D. physical

单选题 In a three-level DBMS architecture, the ()level determines where data are actually stored on the storage device.

A. external
B. conceptual
C. internal
D. physical

单选题 The ()level of a three-level DBMS architecture defines the logical view of the data.

A. external
B. conceptual
C. internal
D. physical

单选题 The data model and the schema of a DBMS are often defined in the () level.

A. external
B. conceptual
C. internal
D. physical